From a mechanistic standpoint I think that mostly has to do with the high cost of entry for games.
At $80-$100 for a full priced game these days, it’s hard to just buy on a whim. The only time you would is when they’re on sale, which happens well after initial release. So initial sales of games are basically entirely driven by reviews and online discourse (which itself has an effect on reviews), and you basically just have a bunch of people all waiting for the signal to buy or not.
I do think that services like Gamepass are a genuinely good way of reducing that effect, because now anyone can try anything on a lark.
Skyrim’s varied gameplay systems?
It has stealth, it has magic, it has melee combat, it has ranged combat, it has dialogue options for talking your way through stuff, it has multiple ways of solving quest lines…
It’s basically Skyrim, if it was smaller and more focused, with better combat, voice acting, level design, and heads and tails better writing.